Heating Installation at Hyundai Santa FE CM

Hello people . I have a question – I have a Santa FE CM and have obtained various offers about an EInbau of a stand heating. The prices for WEBASTO and EBERSPÄCHER “klaffen” there a bit apart. 1700 to 1980 the WEBASTO and 1680 to 1850 the EBERSPÄCHER. as said incl. installation and the hand transmitter to switch on and off ( without status ) the purchase price goes out with about 1000 euro at the Webasto at Eberspächer almost the same. ( ok in the NET you find the things brand new already for r 600 to 800 but I know this can not be used as a comparison ) Does the installation cost then really almost 900 euro ??? how many hours are that ? I would not have thought ( ok how should I know this ) that this is so complicated and difficult . that is unfortunately too expensive to me – and I will buy such a heating fandingsda – if what is no clue gruss Andreas